This is an unusual old piece from La Sirena, from a find that was made after a landslide took out a big section of wall in the section of La Collada de Atrás that is now called La Sirena. For a while there were hundreds of large rock fragments with incredible green, blue and purple fluorites in cavities, and also as loose plates among the rubble. This piece in particular shows the typical modified cubic forms with bevelled corners often seen in La Collada, with excellent luster, great transparency and a greenish blue body tone with diffuse light purple zones in the corners.